I’m keeping my Catalina 25 in the water this winter with the proper bubble wrap. I would like to keep the batteries in the boat so the bilge pump can stay operational in case of an emergency. I was looking at the “2W Battery Saver SE - Solar Trickle Charger” which is available at West Marine for only $35.00. Will this satisfy my needs of keeping my two batteries fully charged during the winter months? Logistically, will I be able to connect the panel to both batteries or will I need to choose 1 and bring the other home for basement storage and charge.